Houston-based Memorial Hermann-Texas Medical Center, the primary teaching hospital for Houston-based UT Health, received the largest gift in its history Tuesday: $25 million from Houston billionaires Fayez and Susan Sarofim, reports the Houston Chronicle.

The donation will go toward a $650 million expansion and renovation project at the teaching hospital. The expansion includes a 17-story patient tower, which will be named the Susan and Fayez Sarofim Pavilion to honor the donors. The tower will house a trauma institute, a comprehensive center for burns and a new helipad for the system's flight-for-life aircrafts.

This is not the first time Mr. Sarofim donated to the Texas Medical Center. In 2006, he donated $25 million to UT Health to establish a research building.

"The Sarofims are just incredibly generous, both individually and as a couple," Memorial Hermann Foundation CEO Anne Neeson said, according to the Houston Chronicle. "They understand how important the trauma services are to our region."